Jarkko Oikarinen is the inventor of the first internet chat "Internet relay chat" (IRC).
An IRC is a text-based Internet-wide, multi-user communication system. Where discussions are organised into channels. The popularity of IRC is based on the fact that the IRC networks consist of servers linked to each other. The user then may connect to any server and join world-wide discussion channels send messages to users on any other server.
Jarkko Oikarinen has been working in many areas in software industry, including multiuser games, software for advanced neurosurgery(surgery performed on the nervous system, especially the brain and spinal cord), medical imaging software, 3D computer graphics, mobile applications and operating systems.
"In 1988 when I was working as a summer intern in University of Oulu (in Finland), and I was the sysop on a BBS (bulletin board system) called OuluBox. That was one of the few BBS systems where one could connect to over both phone lines (using modem) and Internet. I decided to improve the multiuser chat system for OuluBox and IRC was the result of that effort.The name ‘Internet Relay Chat’ was definitely more ambitious than the original intention." This is his exact words during an interview about why he created IRC.
IRC became well known around the world in 1991, when its use skyrocketed as users logged on to get up-to-date information on Iraq's invasion of Kuwait, through a functional IRC link into the country that stayed operational for a week after radio and television broadcasts were cut off.